Leu'K (Fr. Loueclie), a small town of Switzerland, in the canton of Valais, on the right bank of the Rhone (which is here crossed by a bridge connecting with the road on the Sim-plon), 15 m. N. E. of Sion; pop. about 1,200. It contains picturesque ruins and several churches. About 5 m. N. of Leuk is Leukerbad (Fr. Loueche-les-Bains, pop. 600), with many hot springs, situated on the torrent Dala, at the foot of the Gemmi, about 4,600 ft. above the sea. The general temperature of the springs varies from 117° to 124°. They contain some saline matter, but are chiefly beneficial on account of their heat, though the water is slightly cooled before being used. Both sexes bathe together in large basins, wrapped up in thick woollen cloaks, and at the beginning of the cure remain continuously in the water every day from two to four hours. The springs were known in the 12th century. In the vicinity are the famous eight ladders at the foot of a precipice called the Wandfluh, which are placed almost perpendicularly against the face of the cliff.